ISL81801FRTZ-T7A

Datasheet ISL81801 80V Bidirectional 4-Switch Synchronous Buck-Boost Controller The ISL81801 is a true bidirectional 4-switch synchronous buck-boost controller with peak and average current sensing and monitoring at both ends. With wide input and output voltage ranges, the controller is suitable for industrial, telecommunication, and after-market automotive applications. Features The ISL81801 uses a proprietary buck-boost control algorithm with valley current modulation for Boost mode and peak current modulation for Buck mode control. • MOSFET drivers with adaptive shoot-through protection The ISL81801 has four independent control loops for input and output voltages and currents. Inherent peak current sensing at both ends and cycle-by-cycle current limit of this family of products ensures high operational reliability by providing instant current limit in fast transient conditions at either end and in both directions. It also has two current monitoring pins at both input and output to facilitate Constant Current (CC) limit and other system management functions. CC operation down to low voltages avoids any runaway condition at over load or short-circuit conditions. In addition to multilayer overcurrent protection, it also provides full protection features such as OVP, UVP, OTP, average and peak current limit on both input and output to ensure high reliability in both unidirectional and bidirectional operation. The IC is packaged in a space-conscious 32 LD 5mm x5mm TQFN package or easy to assemble 4.4mmx9.7mm 38 LD HTSSOP package. Both packages use an EPAD to improve thermal performance and noise immunity. Low pin count, fewer external components, and default internal values make the ISL81801 an ideal solution for time to market simple power supply designs. The unique DE/Burst mode at light-load dramatically lowers standby power consumption with consistent output ripple over different load levels. • Single inductor 4-switch buck-boost controller • On-the-fly bidirectional operation with independent control of voltage and current on both ends • Proprietary algorithm for smoothest mode transition • Wide input voltage range: 4.5V to 80V • Wide output voltage range: 0.8V to 80V • Supports startup into pre-biased rails • Programmable frequency: 100kHz to 600kHz • Supports parallel operation current sharing with cascade phase interleaving • External sync with clock out or frequency dithering • External bias for higher efficiency for 8V to 36V input • Output and input current monitor • Selectable PWM mode operation between PWM/DE/Burst modes • Accurate EN/UVLO and PGOOD indicator • Low shutdown current: 2.7µA • Complete protection: OCP, SCP, OVP, OTP, and UVP ○ Dual-level OCP with average current and pulse-by-pulse peak current limit, also provides Short Circuit Protection (SCP) ○ Selectable OCP response with either hiccup or constant current mode ○ Negative pulse-by-pulse peak current limit Applications • Battery backup • UPS/storage systems • Battery powered industrial applications • Renewable energy • Aftermarket automotive • Redundant power supplies • Robots and drones • Medical equipment • Building and industrial automation • Security surveillance FN8937 Rev.1.2 Jun 2, 2021 Page 1 of 49 © 2020 Renesas Electronics ISL81801 VDD CS- VIN CS+ CLKEN EN/UVLO FB_IN BSTEN VIN VOUT VDD BOOT1 PGND UG1 VCC5V PHASE1 IMON_IN IMON_OUT ISL81801 TQFN PLL_COMP SGND LG1/ PWM_MODE LG2/ OC_MODE RT/SYNC PHASE2 VDD EXTBIAS ISEN+ BOOT2 ISEN- PGOOD FB_OUT UG2 OV COMP CLKOUT/DITHER SS/TRK Figure 1. Typical Application Diagram 100 90 VIN Rs_in UG1 Rs_out Q4 Q1 VOUT UG2 L Efficiency (%) 80 70 60 50 PH1 PH2 Vin = 9V Vin = 24V Vin = 48V Vin = 80V 40 LG1 Q2 Q3 LG2 Vin = 12V Vin = 36V Vin = 60V 30 0 2 4 6 8 10 IOUT (A) Figure 2. Buck-Boost Power Train Topology FN8937 Rev.1.2 Jun 2, 2021 Figure 3. Efficiency (VOUT = 12V, DE Mode) Page 2 of 49 ISL81801 Contents 1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1 1.2 1.3 2. Typical Application Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Pin Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.1 2.2 3. Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.1 3.2 3.3 3.4 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Thermal Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 12 12 13 4. Typical Performance Graphs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 5.10 5.11 5.12 5.13 5.14 6. General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internal 8V Linear Regulator (VDD), External Bias Supply (EXTBIAS), and 5V Linear Regulator (VCC5V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Enable (EN/UVLO) and Soft-Start Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tracking Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Control Loops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Buck-Boost Conversion Topology and Control Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Light-Load Efficiency Enhancement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Prebiased Power-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Frequency Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Phase Lock Loop (PLL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Frequency Synchronization and Dithering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Parallel Operation Current Sharing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gate Drivers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power-Good Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 25 25 26 27 30 33 34 34 35 35 37 38 39 Protection Circuits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 6.1 6.2 6.3 6.4 6.5 7. Input Undervoltage Lockout (UVLO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VCC5V Power-On Reset (POR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Overcurrent Protection (OCP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Overvoltage Protection (OVP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Over-Temperature Protection (OTP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 40 40 41 41 Layout Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 7.1 7.2 8. Layout Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 General EPAD Design Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Component Selection Guideline. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 8.1 8.2 8.3 8.4 MOSFET Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Inductor Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Output Capacitor Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Input Capacitor Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FN8937 Rev.1.2 Jun 2, 2021 44 45 45 46 Page 3 of 49 ISL81801 9. Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 10. Package Outline Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 FN8937 Rev.1.2 Jun 2, 2021 Page 4 of 49 Typical Application Schematics 9,1 5 5 P 9287 9287 & X &  5 X     5 N  5  5 N Q  S & XY Q & 5 & 5  . Q 5  Q (1 & & 5 N  & P ' 4 1026 4 1026  1.1 Overview ISL81801 FN8937 Rev.1.2 Jun 2, 2021 1.  ' 9  X & Q 5 N 8* (;7%,$6 9,1 &6 &6 ,021B,1 3+$6( & X  & XY X+ )%B,1 %227  4 1026 Y   5 N %67(1 / ' 5 N & &/.(1 (3$'B6*1' 5 N (1B89/2 N (1   9&&9 /*3:0B02'( 8 1& 3*1' ,6/ 576